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1 Dorsal fins are found on the back of the fish. 2  There may be up to three of them. 3  The fish uses this fin for balance in the water and sudden movements. 4  Caudal fins are also known as tail fins.5  This is what we refer to as the fish's tail. 6  Anal fins are on the ventral (bottom) surface of the fish, behind the anus. Dorsal fins are found on the back of the fish. 2  There may be up to three of them. 3  The fish uses this fin for balance in the water and sudden movements. 4  Caudal fins are also known as tail fins.
Today, fins are the most valuable part of a shark. The targeted shark-fin fisheries around the world are trading the fins of between 26 to 73 million sharks every year (according to a 2006 estimate) with a worth of $400-550 million. Driving this trade is the demand for and consumption of shark fin soup in Asia.